FirefoxWeb browser · Mozilla
CVE-2024-1547
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedThrough a series of API calls and redirects, an attacker-controlled alert dialog could have been displayed on another website (with the victim website's URL shown). This vulnerability affects Firefox < 123, Firefox ESR < 115.8, and Thunderbird < 115.8.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidenceThis is a UI redress/spoofing vulnerability where an attacker uses a series of API calls and redirects to display an alert dialog that appears to originate from a victim website. This could enable phishing attacks by tricking users into believing dialogs come from legitimate sites.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data
FirefoxWeb browser
< 115.8.0< 123.0
Debian LinuxOperating system
= 10.0< 115.8.0CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- Required
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- High
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Check Firefox versionIn Firefox, go to Menu > Help > About Firefox, or type 'about:support' in the address bar, or run 'firefox --version' from command lineAffected if installed version is below 115.8.0 or below 123.0 (any version before 115.8.0 or between 115.8.0 and 122.x is affected)
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Check Thunderbird versionIn Thunderbird, go to Menu > Help > About Thunderbird, or run 'thunderbird --version' from command lineAffected if installed version is below 115.8.0 (any version before 115.8.0 is affected)
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Check Debian system package version (if Firefox/Thunderbird installed via apt)Run 'dpkg -l | grep -i firefox' or 'dpkg -l | grep -i thunderbird' to see installed package versionsAffected if package version corresponds to a Firefox/Thunderbird release below the fixed versions
You are affected if you are running any Firefox version below 115.8.0 or below 123.0, or any Thunderbird version below 115.8.0.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
dbcve · scoped115.8.0123.0
Update affected software to Firefox 123, Firefox ESR 115.8, Thunderbird 115.8 or later to patch this vulnerability.
Firefox 123.0 (or Firefox ESR 115.8.0); Thunderbird 115.8.0
- Check current Firefox version: Open Firefox, go to Menu > Help > About Firefox (or visit about:support)
- Check current Thunderbird version: Open Thunderbird, go to Menu > Help > About Thunderbird
- For Firefox: Download and install version 123.0 (regular) or 115.8.0 (ESR) from https://www.mozilla.org/firefox/releases/
- For Thunderbird: Download and install version 115.8.0 from https://www.thunderbird.net/en-US/thunderbird/releases/
- For Debian 10 systems: Run 'apt update && apt install firefox-esr thunderbird' or 'apt update && apt install firefox' to receive the security update
- Restart the application after upgrade
Generated from the published advisory — verify against the referenced sources before acting.
Fix this in Firefox
Scoped from the published advisory
- Consultation2.0 h
- Implementation1.0 h
- Testing1.0 h
- Review / QA1.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,456.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2024-1547 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2024-1547 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.
- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
- No spam, self-promotion, credentials, or personal data